570 
DIPTERA. 
influence of malaria on the inhabitants of a country should consult 
44 Malaria ” by Jones, Ross, and Ellett. 
Fig. 369—A. Tail of pupa of female anopheles. B. of male. 
{After Nuttall and Shipley.) 
The malaria infection by mosquito-bite occurs roughly as follows. 
Suppose a man is suffering from the disease : if a drop of his blood be 
examined under a microscope, there may be found floating about in it a 
number of minute objects called 44 Crescents.” (Fig- 370. C). Now, 
suppose a mosquito bites him : it will suck up with the blood some of 
these crescents ; these will be swallowed by the mosquito, and when they 
reach the insect’s stomach they become round in shape, some of them 
producing long rapidly-moving arms or filaments from their surface. 
Of these round-shaped bodies the ones with filaments (Fig. 370. M.), 
represent males, the others females. Some of the lashing filaments 
break off, and may pierce and become absorbed in one of the female 
bodies : this now fertilized female body imbeds itself in the muscles 
surrounding the mosquito’s stomach, where on dissection it can be seen 
sticking out like a little round pimple. There now develop within it a 
vast number of very minute spindle-shaped 4 4 sporozoites ; ’ ’ the wall of 
the containing female cell then bursts, and these sporozoites are liberated 
into the body of the mosquito, whereupon they make their way to the 
thorax and enter the salivary glands. If now the mosquito bites any¬ 
one, saliva will be injected into the wound, as already described, and 
